Discoverability is lacking atm. But I'm linking people to subs they seem to be looking for, and helping find the places people are looking for will eventually lead to better and better engagement.

Certain magazines/communities are already very active, and finding good threads, if not specific ones, hasn't been hard.

But a lot of them have only just been started, so even with the users on, they havent been found and subbed to, yet.